griefith/test2
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity
Files
8fed30aff22a725eaf94de9645d041bf8093a53e
test2/intern/cycles/kernel/closure/bsdf.h
Alex c6d7bee181 Cycles: Burley diffuse closure for MaterialX compatibility 
Add Burley diffuse to OSL for MaterialX compatibility. It is OSL only and
isn't a closure that will be looked for in SVM.

Pull Request: https://projects.blender.org/blender/blender/pulls/133845
2025-02-04 19:38:56 +01:00

659 lines
22 KiB
C
Raw Blame History

/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
*
* SPDX-License-Identifier: Apache-2.0 */
#pragma once
// clang-format off
#include "kernel/closure/bsdf_ashikhmin_velvet.h"
#include "kernel/closure/bsdf_diffuse.h"
#include "kernel/closure/bsdf_oren_nayar.h"
#include "kernel/closure/bsdf_phong_ramp.h"
#include "kernel/closure/bsdf_diffuse_ramp.h"
#include "kernel/closure/bsdf_microfacet.h"
#include "kernel/closure/bsdf_burley.h"
#include "kernel/closure/bsdf_sheen.h"
#include "kernel/closure/bsdf_transparent.h"
#include "kernel/closure/bsdf_ray_portal.h"
#include "kernel/closure/bsdf_ashikhmin_shirley.h"
#include "kernel/closure/bsdf_toon.h"
#include "kernel/closure/bsdf_hair.h"
#include "kernel/closure/bsdf_principled_hair_chiang.h"
#include "kernel/closure/bsdf_principled_hair_huang.h"
// clang-format on
CCL_NAMESPACE_BEGIN
/* Returns the square of the roughness of the closure if it has roughness,
* 0 for singular closures and 1 otherwise. */
ccl_device_inline float bsdf_get_specular_roughness_squared(const ccl_private ShaderClosure *sc)
{
if (CLOSURE_IS_BSDF_SINGULAR(sc->type)) {
return 0.0f;
}
if (CLOSURE_IS_BSDF_MICROFACET(sc->type)) {
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)sc;
return bsdf->alpha_x * bsdf->alpha_y;
}
return 1.0f;
}
ccl_device_inline float bsdf_get_roughness_pass_squared(const ccl_private ShaderClosure *sc)
{
if (sc->type == CLOSURE_BSDF_OREN_NAYAR_ID) {
ccl_private OrenNayarBsdf *bsdf = (ccl_private OrenNayarBsdf *)sc;
return sqr(sqr(bsdf->roughness));
}
/* For the Principled BSDF, we want the Roughness pass to return the value that
* was set in the node. However, this value doesn't affect all closures (e.g.
* diffuse), so skip those that don't really have a concept of roughness. */
if (CLOSURE_IS_BSDF_DIFFUSE(sc->type)) {
return -1.0f;
}
return bsdf_get_specular_roughness_squared(sc);
}
/* An additional term to smooth illumination on grazing angles when using bump mapping.
* Based on "Taming the Shadow Terminator" by Matt Jen-Yuan Chiang,
* Yining Karl Li and Brent Burley. */
ccl_device_inline float bump_shadowing_term(const int shader_flag,
float3 Ng,
const float3 N,
float3 I)
{
const float cosNI = dot(N, I);
if (cosNI < 0.0f) {
Ng = -Ng;
}
const float g = safe_divide(dot(Ng, I), cosNI * dot(Ng, N));
/* If the incoming light is on the unshadowed side, return full brightness. */
if (g >= 1.0f) {
return 1.0f;
}
/* If the incoming light points away from the surface, return black. */
if (g < 0.0f) {
return 0.0f;
}
/* When bump map correction is not used do skip the smoothing. */
if ((shader_flag & SD_USE_BUMP_MAP_CORRECTION) == 0) {
return 1.0f;
}
/* Return smoothed value to avoid discontinuity at perpendicular angle. */
const float g2 = sqr(g);
return -g2 * g + g2 + g;
}
ccl_device_inline float shift_cos_in(float cos_in, const float frequency_multiplier)
{
/* Shadow terminator workaround, taken from Appleseed.
* SPDX-License-Identifier: MIT
* Copyright (c) 2019 Francois Beaune, The appleseedhq Organization */
cos_in = min(cos_in, 1.0f);
const float angle = fast_acosf(cos_in);
const float val = max(cosf(angle * frequency_multiplier), 0.0f) / cos_in;
return val;
}
ccl_device_inline bool bsdf_is_transmission(const ccl_private ShaderClosure *sc, const float3 wo)
{
return dot(sc->N, wo) < 0.0f;
}
ccl_device_inline int bsdf_sample(KernelGlobals kg,
ccl_private ShaderData *sd,
const ccl_private ShaderClosure *sc,
const int path_flag,
const float3 rand,
ccl_private Spectrum *eval,
ccl_private float3 *wo,
ccl_private float *pdf,
ccl_private float2 *sampled_roughness,
ccl_private float *eta)
{
/* For curves use the smooth normal, particularly for ribbons the geometric
* normal gives too much darkening otherwise. */
*eval = zero_spectrum();
*pdf = 0.f;
int label = LABEL_NONE;
const float3 Ng = (sd->type & PRIMITIVE_CURVE) ? sc->N : sd->Ng;
const float2 rand_xy = make_float2(rand);
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
label = bsdf_diffuse_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
#if defined(__SVM__) || defined(__OSL__)
case CLOSURE_BSDF_OREN_NAYAR_ID:
label = bsdf_oren_nayar_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
# ifdef __OSL__
case CLOSURE_BSDF_BURLEY_ID:
label = bsdf_burley_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_PHONG_RAMP_ID:
label = bsdf_phong_ramp_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
label = bsdf_diffuse_ramp_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
label = bsdf_translucent_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
label = bsdf_transparent_sample(sc, Ng, sd->wi, eval, wo, pdf);
*sampled_roughness = zero_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_RAY_PORTAL_ID:
/* ray portals are not handled by the BSDF code, we should never get here */
kernel_assert(false);
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
label = bsdf_microfacet_ggx_sample(
kg, sc, Ng, sd->wi, rand, eval, wo, pdf, sampled_roughness, eta);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
label = bsdf_microfacet_beckmann_sample(
kg, sc, Ng, sd->wi, rand, eval, wo, pdf, sampled_roughness, eta);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
label = bsdf_ashikhmin_shirley_sample(
sc, Ng, sd->wi, rand_xy, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
label = bsdf_ashikhmin_velvet_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
label = bsdf_diffuse_toon_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
label = bsdf_glossy_toon_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
// double check if this is valid
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
label = bsdf_hair_reflection_sample(
sc, Ng, sd->wi, rand_xy, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
label = bsdf_hair_transmission_sample(
sc, Ng, sd->wi, rand_xy, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
# ifdef __PRINCIPLED_HAIR__
case CLOSURE_BSDF_HAIR_CHIANG_ID:
label = bsdf_hair_chiang_sample(kg, sc, sd, rand, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_HUANG_ID:
label = bsdf_hair_huang_sample(kg, sc, sd, rand, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
# endif
case CLOSURE_BSDF_SHEEN_ID:
label = bsdf_sheen_sample(sc, Ng, sd->wi, rand_xy, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
#endif
default:
label = LABEL_NONE;
break;
}
/* Test if BSDF sample should be treated as transparent for background. */
if (label & LABEL_TRANSMIT) {
const float threshold_squared = kernel_data.background.transparent_roughness_squared_threshold;
if (threshold_squared >= 0.0f && !(label & LABEL_DIFFUSE)) {
if (bsdf_get_specular_roughness_squared(sc) <= threshold_squared) {
label |= LABEL_TRANSMIT_TRANSPARENT;
}
}
}
else {
/* Shadow terminator offset. */
const float frequency_multiplier =
kernel_data_fetch(objects, sd->object).shadow_terminator_shading_offset;
if (frequency_multiplier > 1.0f) {
const float cosNO = dot(*wo, sc->N);
*eval *= shift_cos_in(cosNO, frequency_multiplier);
}
if (label & LABEL_DIFFUSE) {
if (!isequal(sc->N, sd->N)) {
*eval *= bump_shadowing_term(sd->flag, sd->N, sc->N, *wo);
}
}
}
#ifdef WITH_CYCLES_DEBUG
kernel_assert(*pdf >= 0.0f);
kernel_assert(eval->x >= 0.0f && eval->y >= 0.0f && eval->z >= 0.0f);
#endif
return label;
}
ccl_device_inline void bsdf_roughness_eta(const KernelGlobals kg,
const ccl_private ShaderClosure *sc,
const float3 wo,
ccl_private float2 *roughness,
ccl_private float *eta)
{
#ifdef __SVM__
float alpha = 1.0f;
#endif
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
#ifdef __SVM__
case CLOSURE_BSDF_OREN_NAYAR_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
# ifdef __OSL__
case CLOSURE_BSDF_BURLEY_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_PHONG_RAMP_ID:
alpha = phong_ramp_exponent_to_roughness(((const ccl_private PhongRampBsdf *)sc)->exponent);
*roughness = make_float2(alpha, alpha);
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
case CLOSURE_BSDF_RAY_PORTAL_ID:
*roughness = zero_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID: {
const ccl_private MicrofacetBsdf *bsdf = (const ccl_private MicrofacetBsdf *)sc;
*roughness = make_float2(bsdf->alpha_x, bsdf->alpha_y);
*eta = (bsdf_is_transmission(sc, wo)) ? bsdf->ior : 1.0f;
break;
}
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID: {
const ccl_private MicrofacetBsdf *bsdf = (const ccl_private MicrofacetBsdf *)sc;
*roughness = make_float2(bsdf->alpha_x, bsdf->alpha_y);
*eta = 1.0f;
break;
}
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
// double check if this is valid
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
*roughness = make_float2(((ccl_private HairBsdf *)sc)->roughness1,
((ccl_private HairBsdf *)sc)->roughness2);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
*roughness = make_float2(((ccl_private HairBsdf *)sc)->roughness1,
((ccl_private HairBsdf *)sc)->roughness2);
*eta = 1.0f;
break;
# ifdef __PRINCIPLED_HAIR__
case CLOSURE_BSDF_HAIR_CHIANG_ID:
alpha = ((ccl_private ChiangHairBSDF *)sc)->m0_roughness;
*roughness = make_float2(alpha, alpha);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_HUANG_ID:
alpha = ((ccl_private HuangHairBSDF *)sc)->roughness;
*roughness = make_float2(alpha, alpha);
*eta = 1.0f;
break;
# endif
case CLOSURE_BSDF_SHEEN_ID:
alpha = ((ccl_private SheenBsdf *)sc)->roughness;
*roughness = make_float2(alpha, alpha);
*eta = 1.0f;
break;
#endif
default:
*roughness = one_float2();
*eta = 1.0f;
break;
}
}
ccl_device_inline int bsdf_label(const KernelGlobals kg,
const ccl_private ShaderClosure *sc,
const float3 wo)
{
/* For curves use the smooth normal, particularly for ribbons the geometric
* normal gives too much darkening otherwise. */
int label;
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
case CLOSURE_BSSRDF_BURLEY_ID:
case CLOSURE_BSSRDF_RANDOM_WALK_ID:
case CLOSURE_BSSRDF_RANDOM_WALK_SKIN_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
#ifdef __SVM__
case CLOSURE_BSDF_OREN_NAYAR_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
# ifdef __OSL__
case CLOSURE_BSDF_BURLEY_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_PHONG_RAMP_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
label = LABEL_TRANSMIT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
label = LABEL_TRANSMIT | LABEL_TRANSPARENT;
break;
case CLOSURE_BSDF_RAY_PORTAL_ID:
label = LABEL_TRANSMIT | LABEL_RAY_PORTAL;
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID: {
const ccl_private MicrofacetBsdf *bsdf = (const ccl_private MicrofacetBsdf *)sc;
label = ((bsdf_is_transmission(sc, wo)) ? LABEL_TRANSMIT : LABEL_REFLECT) |
((bsdf_microfacet_eval_flag(bsdf)) ? LABEL_GLOSSY : LABEL_SINGULAR);
break;
}
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
label = LABEL_TRANSMIT | LABEL_GLOSSY;
break;
# ifdef __PRINCIPLED_HAIR__
case CLOSURE_BSDF_HAIR_CHIANG_ID:
if (bsdf_is_transmission(sc, wo)) {
label = LABEL_TRANSMIT | LABEL_GLOSSY;
}
else {
label = LABEL_REFLECT | LABEL_GLOSSY;
}
break;
case CLOSURE_BSDF_HAIR_HUANG_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
# endif
case CLOSURE_BSDF_SHEEN_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
#endif
default:
label = LABEL_NONE;
break;
}
/* Test if BSDF sample should be treated as transparent for background. */
if (label & LABEL_TRANSMIT) {
const float threshold_squared = kernel_data.background.transparent_roughness_squared_threshold;
if (threshold_squared >= 0.0f) {
if (bsdf_get_specular_roughness_squared(sc) <= threshold_squared) {
label |= LABEL_TRANSMIT_TRANSPARENT;
}
}
}
return label;
}
#ifndef __KERNEL_CUDA__
ccl_device
#else
ccl_device_inline
#endif
Spectrum
bsdf_eval(KernelGlobals kg,
ccl_private ShaderData *sd,
const ccl_private ShaderClosure *sc,
const float3 wo,
ccl_private float *pdf)
{
Spectrum eval = zero_spectrum();
*pdf = 0.f;
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
eval = bsdf_diffuse_eval(sc, sd->wi, wo, pdf);
break;
#if defined(__SVM__) || defined(__OSL__)
case CLOSURE_BSDF_OREN_NAYAR_ID:
eval = bsdf_oren_nayar_eval(sc, sd->wi, wo, pdf);
break;
# ifdef __OSL__
case CLOSURE_BSDF_BURLEY_ID:
eval = bsdf_burley_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_PHONG_RAMP_ID:
eval = bsdf_phong_ramp_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
eval = bsdf_diffuse_ramp_eval(sc, sd->wi, wo, pdf);
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
eval = bsdf_translucent_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
eval = bsdf_transparent_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_RAY_PORTAL_ID:
eval = bsdf_ray_portal_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
/* For consistency with eval() this should be using sd->Ng, but that causes
* artifacts (see shadow_terminator_metal test). Needs deeper investigation
* for how to solve this. */
eval = bsdf_microfacet_ggx_eval(kg, sc, sd->N, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
eval = bsdf_microfacet_beckmann_eval(kg, sc, sd->N, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
eval = bsdf_ashikhmin_shirley_eval(sc, sd->N, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
eval = bsdf_ashikhmin_velvet_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
eval = bsdf_diffuse_toon_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
eval = bsdf_glossy_toon_eval(sc, sd->wi, wo, pdf);
break;
# ifdef __PRINCIPLED_HAIR__
case CLOSURE_BSDF_HAIR_CHIANG_ID:
eval = bsdf_hair_chiang_eval(kg, sd, sc, wo, pdf);
break;
case CLOSURE_BSDF_HAIR_HUANG_ID:
eval = bsdf_hair_huang_eval(kg, sd, sc, wo, pdf);
break;
# endif
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
eval = bsdf_hair_reflection_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
eval = bsdf_hair_transmission_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_SHEEN_ID:
eval = bsdf_sheen_eval(sc, sd->wi, wo, pdf);
break;
#endif
default:
break;
}
if (CLOSURE_IS_BSDF_DIFFUSE(sc->type)) {
if (!isequal(sc->N, sd->N)) {
eval *= bump_shadowing_term(sd->flag, sd->N, sc->N, wo);
}
}
/* Shadow terminator offset. */
const float frequency_multiplier =
kernel_data_fetch(objects, sd->object).shadow_terminator_shading_offset;
if (frequency_multiplier > 1.0f) {
const float cosNO = dot(wo, sc->N);
if (cosNO >= 0.0f) {
eval *= shift_cos_in(cosNO, frequency_multiplier);
}
}
#ifdef WITH_CYCLES_DEBUG
kernel_assert(*pdf >= 0.0f);
kernel_assert(eval.x >= 0.0f && eval.y >= 0.0f && eval.z >= 0.0f);
#endif
return eval;
}
ccl_device void bsdf_blur(KernelGlobals kg, ccl_private ShaderClosure *sc, const float roughness)
{
/* TODO: do we want to blur volume closures? */
#if defined(__SVM__) || defined(__OSL__)
switch (sc->type) {
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
/* TODO: Recompute energy preservation after blur? */
bsdf_microfacet_blur(sc, roughness);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
bsdf_ashikhmin_shirley_blur(sc, roughness);
break;
# ifdef __PRINCIPLED_HAIR__
case CLOSURE_BSDF_HAIR_CHIANG_ID:
bsdf_hair_chiang_blur(sc, roughness);
break;
case CLOSURE_BSDF_HAIR_HUANG_ID:
bsdf_hair_huang_blur(sc, roughness);
break;
# endif
default:
break;
}
#endif
}
ccl_device_inline Spectrum bsdf_albedo(KernelGlobals kg,
const ccl_private ShaderData *sd,
const ccl_private ShaderClosure *sc,
const bool reflection,
const bool transmission)
{
Spectrum albedo = sc->weight;
/* Some closures include additional components such as Fresnel terms that cause their albedo to
* be below 1. The point of this function is to return a best-effort estimation of their albedo,
* meaning the amount of reflected/refracted light that would be expected when illuminated by a
* uniform white background.
* This is used for the denoising albedo pass and diffuse/glossy/transmission color passes.
* NOTE: This should always match the sample_weight of the closure - as in, if there's an albedo
* adjustment in here, the sample_weight should also be reduced accordingly.
* TODO(lukas): Consider calling this function to determine the sample_weight? Would be a bit of
* extra overhead though. */
#if defined(__SVM__) || defined(__OSL__)
if (CLOSURE_IS_BSDF_MICROFACET(sc->type)) {
albedo *= bsdf_microfacet_estimate_albedo(
kg, sd, (const ccl_private MicrofacetBsdf *)sc, reflection, transmission);
}
# ifdef __PRINCIPLED_HAIR__
else if (sc->type == CLOSURE_BSDF_HAIR_CHIANG_ID) {
/* TODO(lukas): Principled Hair could also be split into a glossy and a transmission component,
* similar to Glass BSDFs. */
albedo *= bsdf_hair_chiang_albedo(sd, sc);
}
else if (sc->type == CLOSURE_BSDF_HAIR_HUANG_ID) {
albedo *= bsdf_hair_huang_albedo(sd, sc);
}
# endif
#endif
return albedo;
}
CCL_NAMESPACE_END
Reference in New Issue View Git Blame Copy Permalink